Electric motor



8@ v13, 1940- F. c. DOUGHMAN 221L006 ELECTRIC MOTOR Filed Sept. 1, 193'? I INVENTOR JW C ATTORN Y.

Patented Aug; 13, i

v UNITED STATES PATENT OFFICE.

'ELEc'rmc Moron Ferman-C. Doughman; Stamford, Conn., assignor to Electrolux Corporation, Dover; Del., a cornotation of Delaware Application September 1, 1937, Serial Nb. 161,929

I '1 Claims. (c1. 171-424 My invention relates to electric motors and of boss 231s pierced for the entrance of shunt more particularlyto. brush holders and supports l3. which is soldered therein, as indicated at 30.- therefor. Terminal member I8 with its integral guide mem- An object of my invention is to provide an imbers 20 and- 2| and lug 22 providesa convenient proved brush holder and support which will means for assembling and securing the brush I6 5 lengthen the life of the brushes and the commu in the holder I2 and an emcient terminal for contator of the electric motor. ductor or lead 28 at the same time reducing the A further object of my invention is to provide number of parts comprising the brush and holder 9. brush holder and support of simple c0nstruc-- assembly to a minimum.

0 tion which will insure the correct and permanent For securing the brush holder |2 in end shield positioning of the brush holder. H, a locking plate 3| of spring metal or resilient What Iconsider to be novel, and my invention material is provided. having a central opening may be better understood by reference. to the .32 and two end openings 33. Locking plate following specifications and appended claims 3L is of dished shape; as better indicated in whenconsidered in connection with the accom- Fig. 4. For positioning locking plate ,3| on panying drawing in which: brush holder l2, opening 32 is provided con- Fig. 1 is a plan viewoi a portion of an electric iorming to the. shape of the top of body motor with my improved brush holder and supmember I! and having two notches 34 which enport; a gage the projections 23 and 24 of body member Fig. 2 is an end view or the motor with the ll. After the brush and its connected parts are 20 brush holder; secured in brush holder I2, the assembly is in- Fig. 3 is an exploded view of the brush holder, serted in an opening 35 provided therefor in end brush, and locking plate; shield The brush holder rests on a flange 36 Fig. 4 is a detail view of the locliing plate, and of the body member. M in engagement with the 3 Fig. 5 isa detailview of a portion of the brush portion of end shield ll around the opening 35.

assembly. 'I-'he locking plate 3| is then passed over the top Referring to the drawingfl-li indicates an elecor body-member I4 and secured against the flange v tric motor havingan end shield II in which a 36 by means of two screws 31 which pass through brush holder I2' is mounted. Brush holder |2 openings 33. The screws 31 are threaded into 80 consists of a metal insert I3 and a body I! of endshield H and are tightened until the plate moulded plasticmaterial. Insert |3 has a sub- 3| is substantially fiat.- The electrical conductor stantially rectangular bore IS in which a brush 23 is then connected to the brush l6" by means of I6 is carried. Connected to brush I6 is a spring binding screw26.

l1 which serves to provide the desired brush In the operation of an electric motor, vibrato pressure to maintain it in contact with the com-"- tions are produced which tend to loosen the 85 mutator of the motor arrnature, not shownI To screws which hold the brush holder in the end the opposite end of spring H, a terminal I8 is shield. "when these screws are loosened, the secured. 'Terminal I8 is electrically connected brush holder tends to chatter or may slightly to the brush l6 by means of ashunt IS. TO se shift its position and afiect the operation of the -49, cure the brush IS in the brush holder l2, terminal electric motor. Movement or chattering of the I8 is provided with two integral guide members brush holder produces anarc'between the brush 20 and 2| which fit into sides'of rectangular bore and the commutator of the motor. This in- |5 of insert |3 and down-turned terminal lug 22 creases the wear of the brush and pits the surwhich rests on the outside of insert i3 and is poface of'the commutator, thus shortening the life 5 sitioned between two projections 23 and 24 of body of the motor. To overcome this dimculty, my member l4. Lug 22 has an opening 25 through improved brushholder is supplied wlthresilient v a which a screw 26 passes entering a screw threaded locking plate 3| of dished shape so that when one opening 21 of insert l3. Screw 26 serves the dual or the other of-the securing screws 31 becomes purpose of securing brush l6 and its connected loosened, the locking plate 3| which has been parts in brush holder l2 and also connecting an tightened until it is substantially 'fiat, bends 50 electricallead 28 to the-brush l6, as better indislightly maintaining the brush holder l2 securely cated in Figs. 1 and '2. Terminal member I8 is in position in-opening 35 and producing a force provided with a central inwardIy extending boss tending to prevent a further loosening of the 29, as-best indicated in Fig. 5, which serves as a screws 31. .c' i positioning means for the spring l1. The center By providing the locking plate 3| 0! spring metal and in dished shape, the screws 31 may loosen a considerable amount before there is any tendency for-the brush holder l2 to chatter or shift its position. Also the plate 3| acts as a lock washer for the screws 31 and thus reduces the tendency for the screws to loosen.

From the foregoing, it may be seen that an improved brush holder support is provided of simple construction which'lengthens the life of the electric motor by insuring a permanent rigid positioning of the brush holder. In addition, the brush holder assembly consists of a minimum number of parts easy to manufacture and assemble. g a

What I claim is:

1. In an electric motor, a brush, a holder for said brush having afiange resting around an opening in said motor, and a clamping plate engaging said flange for securing said holder to said motor and being biased to a dish shaped form. K

2. In an electric motor, a brush, a holder for said brush having a flange resting around an opening in said motor, and a clamping plate of spring metal engaging said flange for securing said holder to said motor and being biased to a dish shaped form.

3. In an electric motor, a brush, a holder for said brush having" a flange, a plate of resilient material having an-opening permitting the plate to pass part way over said holder into engagement with said flange, and means for securing said plate to said motor.

4. In anelectric motor, a brush of rectangular cross section, a holder for said brush having a rectangular bore, a spring secured to said brush at one end, a shunt connected to said brush; a terminal member having depending guide members engaging the sides of said rectangular bore, and a screw for securing said terminal member to said holder and for connecting a conductorto said -brush.'

5. In an-electric motor, a brush of rectangular cross section, a holder for said brush having a.

rectangular bore, a spring secured to said brush at one end, a shunt connected to said brush, a terminal member having depending guide members engaging the sides of said rectangular bore and a terminal lug, and a screw for securin said terminal member to said holder and for connecting a conductor to said terminal lug.

6. In an electric motor, a brush, a holder for said brush, a spring secured to said brush at one end, a shunt connected to said brush, a terminal member having integral guide members engaging said holder and a terminal lug overlying a portion of said holder, and a screw for securing said terminal member to said-holder and for connecting a conductor to said brush.

7 In an electric motor, a brush, a holder for said brush, a spring secured to said brush at one end, a shunt connected to said brush, a terminal member having depending guide members and a terminal lug connected to said shunt and secured to said spring, means for securing said terminal member to said holder, and a locking plate of resilient material for securing said holder to said motor.

FERMAN C. DOUGHMAN. 

